Introduction to the working principle of RFID reader

2021-08-12 17:05:26

The rfid reader is a device that performs read/write operations on RFID tags, and it mainly includes two parts: a radio frequency module and a digital signal processing unit.

The rfid reader is the most important infrastructure in the RFID system. On the one hand, the electromagnetic signal returned by the RFID tag enters the radio frequency module of the rfid reader through the antenna to be converted into a digital signal, and then is processed by the digital signal processing unit of the rfid reader. Necessary processing and shaping, and finally demodulate the returned information from it to complete the recognition or read/write operation of the RFID tag; on the other hand, the upper-level middleware and application software interact with the rfid reader to realize the execution of operating instructions and data Summary upload.

When uploading data, the rfid reader will perform deduplication filtering or simple condition filtering on the atomic event of the RFID tag, and process it into a reader event before uploading, so as to reduce the flow of data exchange with middleware and application software. Therefore, microprocessors and embedded systems are also integrated in many rfid readers to realize part of the functions of middleware, such as signal state control, parity error checking and correction, etc.